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Table 2. TNM Definitions for Stage 0 Melanoma

Stage TNM Description Image 
Clinicala Pathologicalb
Stage 0 melanoma in situ; drawing shows skin anatomy with an abnormal area on the surface of the skin. Both normal and abnormal melanocytes and melanin are shown in the epidermis (outer layer of the skin). Also shown are the dermis (inner layer of the skin) and the subcutaneous tissue below the dermis.
Stage 0 melanoma in situ.
00TisMelanoma in situ
N0No regional metastases
M0No detectable evidence of distant metastases
T = primary tumor; N = regional lymph nodes; M = distant metastasis.
Adapted with permission from AJCC: Melanoma of the skin. In: Edge SB, Byrd DR, Compton CC, et al., eds.: AJCC Cancer Staging Manual. 7th ed. New York, NY: Springer, 2010, pp 325-44.
The explanations for superscripts a and b are at the end of Table 7.